Two-State Controller; Two-State Controller - Pid; Two-State Controller Fuzzy , Afuza, Afuzs - Ecolab MULTRONIC Notice Technique

8.3

Two-state controller

8.3.1

Two-state controller - PID

The PID controller should be given preference if optimised PID parameters are available or the
fuzzy controller is not exact or fast enough.
The software has incorporated a switching hysteresis of 1% in order to prevent the output from
switching wildly backwards and forwards about the setpoint. This hysteresis is permanently
programmed and cannot be changed. The two-state controller is assigned a second output as
a standard feature; this can be used as a signal output with a hysteresis.
Parameters
Setpoint (W):
Proportional area (XP1):
Prelime time (T v ):
Delay time (T n ):
ON period (T min ):
Setpoint difference (LW):
Switch difference (X2Sd):
8.3.2

Two-state controller Fuzzy , aFUZa, aFUZs

For the standard fuzzy controller only the setpoint value (W) and the approximate down time
need be entered. The fuzzy controller reacts immediately to events and offers a high level of
precision in the setpoint value range.
Both adaptive fuzzy controllers aFUZa and aFUZs adapt automatically to the process. The
adaptive fuzzy controller aFUZa has an algorithm for asymptomatic approximation of the
setpoint value. The adaptive fuzzy controller aFUZs is optimised for rapid approximation of the
setpoint value while accepting over-oscillation.
Control is by means of a 'fuzzy algorithm'. The controller clocks.
Parameters
Setpoint value (W):
Delay time:
Setpoint difference (LW):
Switch difference (X2Sd):
417101163_Multronic.doc
Setpoint value within the measuring range (including
switching point 1)
PID-action (see chapter 8.6)
Set internally and permanently to 0.5 seconds.
The distance between switching point 2 and the setpoint
value. Given in positive and negative values; can also be
given in absolute values.
Switching hysteresis of switching point 2; percentage
relates to the absolute value of switching point 2.
Setpoint value within the measuring range (including
switching point 1)
Modification of the actual value by a certain range
(does not apply to adaptive fuzzy controllers aFUZa and
aFUZs )
The distance between switching point 2 and the setpoint
value. Given in positive and negative values; can also be
given in absolute values.
Switching hysteresis of switching point 2; percentage
relates to the absolute value of switching point 2.
- 62 - Rev: 5.07-08